Learn JavaScript from Scratch JavaScript for Everyone - Try, Catch, and Finally

Why is using try-catch blocks in JavaScript considered beneficial?

• It is a requirement in all JavaScript programs.

• It helps in gracefully handling errors without crashing the program.

• It makes the code run faster.

• It automatically fixes all errors.

What happens if a function that doesn't exist is called without a try-catch block?

• The program will stop executing further code.

• The program will automatically create the function.

• The program will log a warning and continue.

• The program continues to run without any issues.

What is the purpose of the throw keyword in JavaScript?

• To create a new function.

• To stop the execution of a loop.

• To declare a new variable.

• To manually trigger an error.

What is the role of the finally block in a try-catch-finally structure?

• It prevents the catch block from executing.

• It executes only if there is no error.

• It executes only if there is an error.

• It executes regardless of whether an error occurred or not.

What will happen if you try to reassign a constant variable inside a try block?

• An error will be thrown.

• The program will ignore the reassignment.

• The reassignment will succeed.

• The constant will be converted to a variable.

Why is it advised not to nest try-catch blocks?

• It automatically causes syntax errors.

• It is not supported in JavaScript.

• It can lead to messy and hard-to-maintain code.

• It makes the code run slower.

What is a common mistake when using try-catch blocks?

• Using them to handle logical errors.

• Using them to handle network errors.

• Using them to handle runtime errors.

• Using them to handle syntax errors.